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    删除节点<br> node.removeChild(子节点) node 父元素 方法返回被删除元素
    <br>
    <button>删除</button>
    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
    </ul>
    <script>
        var ul = document.querySelector('ul');
        var btn = document.querySelector('button');
        // ul.removeChild(ul.children[0]);
        btn.onclick = function() {
            if (ul.children.length === 0) {
                this.disabled = true
            } else {
                var e = ul.removeChild(ul.children[0]);
                if (e) {
                    alert('删除' + e.innerHTML + '成功');
                }
            }
        }
    </script>
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